At 18oC a small proportion of individuals eclose showing thread-like, pale yellow bristles and hairs and wrinkled wings.
Hemizygous males survive at low temperatures and show no enhancement of the wa phenotype and strong suppression of f1 penetrance.
Lethality occurs during larval or pupal stages. Homozygous germline clones display no maternal effect. Embryos derived from heterozygous mothers exhibit neither CNS or PNS defects.
su(f)4 flies die at the time of puparium formation at 24-25oC. At 17-18oC, the flies are viable, have thread-like pale yellow bristles and hairs, dark pigment at the dorsal anterior portion of the thorax and somewhat wrinkled or curled wings. Males do not appear sufficiently energetic to mate. su(f)4/su(f)2 flies are viable at 17-18oC, 24-25oC and 29-30oC, and are normal for the "pale bristles" phenotype. su(f)4/su(f)6 females are fully viable and normal at 17-18oC, vary in viability and show a broad streak of dark pigment on the thorax at 24-25oC, but die some time before puparium formation at 29-30oC. su(f)4/su(f)3 females are fully viable at 17-18oC, and some of the bristles and hairs show the "pale bristles" phenotype, although the texture of the wings appears normal.
Lethal at 24-25o and 29-30oC. Fully viable (but weak) at 17-18oC provided overcrowding is prevented. Body colour: bristles and hairs are pale yellow, dark pigment on the thorax is usually concentrated at the dorsal anterior region. Bristles are thread-like. Wings are curled or wrinkled. su(f)4/su(f)3 flies die at about the time of puparium formation at 24-25oC. At 17-18oC they are fully viable, with some bristles and hairs of all individuals showing the su(f)4 phenotype and the texture of the wings appearing abnormal. su(f)4/su(f)6 females are fully viable and normal at 17-18oC. At 24-25oC, they vary in viability, show a broad streak of dark pigment on the thorax which is sometimes concentrated at the dorsal anterior region and have wings which sometimes stick up and out. At 29-30oC, they die just prior to puparium formation. su(f)4/su(f)8 females are fully viable and normal at 17-18oC and 24-25oC, but are fully viable and Minute-like at 29-30oC. su(f)4/Df(1)D43L1 females die at about the time of puparium formation at 24-25oC, but die just prior to eclosion at 17-18oC.
Temperature-sensitive lethal. Lethality at late pupal stage; homozygous germ-line clones show no maternal effect in homozygous germ-line clones; also, no zygotic effects on development of peripheral or central nervous systems (Perrimon, Smouse and Miklos, 1989).